import winsup-2000-02-17 snapshot

1 files changed, 173 insertions, 0 deletions

diff --git a/winsup/cygwin/profil.c b/winsup/cygwin/profil.c
new file mode 100644
index 000000000..956519b4e
--- /dev/null
+++ b/winsup/cygwin/profil.c
@@ -0,0 +1,173 @@
+/* profil.c -- win32 profil.c equivalent
+
+   Copyright 1998 Cygnus Solutions.
+
+   This file is part of Cygwin.
+
+   This software is a copyrighted work licensed under the terms of the
+   Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+   details. */
+
+#include <windows.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <math.h>
+
+#include <profil.h>
+
+#define SLEEPTIME (1000 / PROF_HZ)
+
+/* global profinfo for profil() call */
+static struct profinfo prof;
+
+/* Get the pc for thread THR */
+
+static u_long
+get_thrpc (HANDLE thr)
+{
+  CONTEXT ctx;
+  u_long pc;
+  int res;
+
+  res = SuspendThread (thr);
+  if (res == -1)
+    return (u_long) - 1;
+  ctx.ContextFlags = CONTEXT_CONTROL | CONTEXT_INTEGER;
+  pc = (u_long) - 1;
+  if (GetThreadContext (thr, &ctx))
+    pc = ctx.Eip;
+  ResumeThread (thr);
+  return pc;
+}
+
+/* Display cell of profile buffer */
+#if 0
+static void
+print_prof (struct profinfo *p)
+{
+  printf ("profthr %x\ttarget thr %x\n", p->profthr, p->targthr);
+  printf ("pc: %x - %x\n", p->lowpc, p->highpc);
+  printf ("scale: %x\n", p->scale);
+  return;
+}
+#endif
+
+/* Everytime we wake up use the main thread pc to hash into the cell in the 
+   profile buffer ARG. */
+
+static DWORD CALLBACK
+profthr_func (LPVOID arg)
+{
+  struct profinfo *p = (struct profinfo *) arg;
+  u_long pc, idx;
+
+  for (;;)
+    {
+      pc = (u_long) get_thrpc (p->targthr);
+      if (pc >= p->lowpc && pc < p->highpc)
+	{
+	  idx = PROFIDX (pc, p->lowpc, p->scale);
+	  p->counter[idx]++;
+	}
+#if 0
+      print_prof (p);
+#endif
+      Sleep (SLEEPTIME);
+    }
+  return 0;
+}
+
+/* Stop profiling to the profiling buffer pointed to by P. */
+
+static int
+profile_off (struct profinfo *p)
+{
+  if (p->profthr)
+    {
+      TerminateThread (p->profthr, 0);
+      CloseHandle (p->profthr);
+    }
+  if (p->targthr)
+    CloseHandle (p->targthr);
+  return 0;
+}
+
+/* Create a timer thread and pass it a pointer P to the profiling buffer. */
+
+static int
+profile_on (struct profinfo *p)
+{
+  int thrid;
+
+  /* get handle for this thread */
+  if (!DuplicateHandle (GetCurrentProcess (), GetCurrentThread (),
+			GetCurrentProcess (), &p->targthr, 0, FALSE,
+			DUPLICATE_SAME_ACCESS))
+    {
+      errno = ESRCH;
+      return -1;
+    }
+
+  p->profthr = CreateThread (0, 0, profthr_func, (void *) p, 0, &thrid);
+  if (!p->profthr)
+    {
+      CloseHandle (p->targthr);
+      p->targthr = 0;
+      errno = EAGAIN;
+      return -1;
+    }
+  return 0;
+}
+
+/*
+ * start or stop profiling
+ *
+ * profiling goes into the SAMPLES buffer of size SIZE (which is treated
+ * as an array of u_shorts of size size/2)
+ * 
+ * each bin represents a range of pc addresses from OFFSET.  The number
+ * of pc addresses in a bin depends on SCALE.  (A scale of 65536 maps
+ * each bin to two addresses, A scale of 32768 maps each bin to 4 addresses,
+ * a scale of 1 maps each bin to 128k addreses).  Scale may be 1 - 65536,
+ * or zero to turn off profiling
+ */
+int
+profile_ctl (struct profinfo * p, char *samples, size_t size,
+	     u_long offset, u_int scale)
+{
+  u_long maxbin;
+
+  if (scale > 65536)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  profile_off (p);
+  if (scale)
+    {
+      memset (samples, 0, size);
+      memset (p, 0, sizeof *p);
+      maxbin = size >> 1;
+      prof.counter = (u_short *) samples;
+      prof.lowpc = offset;
+      prof.highpc = PROFADDR (maxbin, offset, scale);
+      prof.scale = scale;
+
+      return profile_on (p);
+    }
+  return 0;
+}
+
+/* Equivalent to unix profil() 
+   Every SLEEPTIME interval, the user's program counter (PC) is examined: 
+   offset is subtracted and the result is multiplied by scale.  
+   The word pointed to by this address is incremented.  Buf is unused. */
+
+int
+profil (char *samples, size_t size, u_long offset, u_int scale)
+{
+  return profile_ctl (&prof, samples, size, offset, scale);
+}
+